Rodless pump



May 24, 1938. w. N. HUFF .2,118,307

RoDLEss PUMP Filed July 27. 1956 2 sheets-s119651 :ses: l 35 n sa 7) f/A forneys May 24, 1938.

Filed July 27. 1956l 2 Sheets-Sheet 2 Inventor w 7 n o@ k ,i N 7 O Qlllllllllll Il A torneys Patented May 24, 1938 UNITED STATES PATENTOFFICE 3 Claims.

This invention pertains to rodless pumps of the general typeconstituting the subject matter of my co-pending United Statesapplications Serial Numbers 44,114, illed Oct. 8, 1935, now Patent No.

r, 2,058,445 dated October 27th, 1936, 64,920 led February 20, 1936 andnow abandoned and 80,211, led May 16, 1936.

The primary object of the present invention is to provide, in a rodlesspump of the type includ- 10 Aing a spring elevated iluid lifting piston.novel means for lowering said piston against the tension of the springthrough the medium of a fluid, together with means for controlling theoperating iluid as well as the fluid being pumped.

Another very important object of the invention is to provide a fluidoperating mechanism for a rodless pump of the aforementioned characterembodying novel means for maintaining a constant and uniform pressure onthe operating fluid. Other objects of the invention are to provide arodless pump of the character described which will 'be comparativelysimple in' construction, strong, durable, and reliable in use.

All of the foregoing and still further objects :s and advantages of theinvention will become apparent from a study of the followingspecication, taken in connection with the accompanying drawings whereinlike characters of reference designate corresponding parts throughoutthe sev- 30 eral views, and wherein:-

Figure l is a view in side elevation of an embodiment of the apparatusconstituting the present invention, the well casing being shown insection.

Figure 2 is a vertical sectional view, showing the pump installed in atubing which is made therefor.

Figure 3 is a vertical sectional view through the invention, showing thesame installed in a 40 conventional tubing.

Figure 4 is a view in horizontal section, taken substantially on theline 4-4 of Figure 3.

Figure 5 is a view in vertical section through the pressure pump andaccumulator.

Figure 6 is a detail view in vertical section through the multiwayvalve, showing the same connecting the pressure pump to the well.

Figure '7 is a detail view in vertical section -through the multiwayvalve, showing the same 50 connecting the well to the storage tank.

Referring now to the drawings in detail and to Figure 3 thereof inparticular, it will be seen that the reference numeral I designates aconventional tubing in the lower end of which is 55 threaded a barrel 2.Mounted inthe lower end portion of the tubing I is a sleeve 3 having areduced, threaded lower end portion 4 on which a vseat 5 is mounted,said seat being adapted to rest on the shoulder provided by the upperend of the barrel 2. Cup washers 6 are clamped between the seat 5 andthe shoulder provided by the reduced end portion 4.

Mounted for vertical movement in the sleeve 3 is a floating cylinder 1which terminates, at its lower end, in a valve 8 which is engageable ona seat 9 which is provided therefor in the lower end portion of saidsleeve. Stops I are provided in the sleeve 3 at an intermediate pointfor engagement by the valve 8 for limiting the upward movement of theiloating cylinder 1.'

Extending upwardly from the barrel 2 through the floating cylinder 'Iand the sleeve 3 into the tubing I is a sectional rod II having mountedthereon at an intermediate point for reciprocation in the iloatingcylinder 'l a comparatively small piston I2. On the lower end of the rodII is a valve piston I3 which travels in the barrel 2. A plug I4 isthreaded in the upper end portion of the sleeve 3 and engaged thereon isa coil spring I5. The upper end of the coil spring I' is engaged in acup member I6 which is mounted on the upper end portion of the rod II.

In the operation of the invention as thus far described, fluid underpressure is forced downwardly in the tubing I and acts on the piston I2to force the piston I3 downwardly in the barrel 2 against the `tensionof the coil spring J5. When this occurs the valve 8 engages the seat 9to prevent the downward flow of fluid into the barrel 2. The fluidpressure in the tubing I is then released and the coil spring I5immediately expands, elevating the piston I3 and lifting the fluid whichhas passed through said piston into the upper portion of the barrel 2upwardly into the tubing I, the valve 8 lifting off the seat 9 to permitthe passage of this iiuid. I'his operation is then repeated.

In the arrangement shown in Figure 2 of the drawings, the barrel 2 isconnected to the tubing I by a coupling I1. The coupling II has formedtherein, at an intermediate point, a seat I8 on which the valve 5 rests.It will thus be seen that in this arrangement the tubing is prepared forthe reception of the pump while in that shown in Figure 3 the tubingalready in the well is used.

The apparatus which has been illustrated for forcing the operating fluidinto the well corn--` prises a pump It of the reciprocating piston typevvl'iich'isVV driven from a suitable power plant 20. -The cylinder head2l, of the pump I9 has mount- Cil ed therein intake and exhaust checkvalves 22 and 23, respectively. A conduit 24 extends from the intake ofthe pump I9 to a fluid supply tank 25. A conduit 26 connects the outletof the pump I9 to the upper end of the tubing I.

Interposed in the conduit 26 is a multiway valve 21 connected by aconduit 28 to a storage tank 29. Mounted on the cylinder head 2l andcommunicating with the conduit 26 as well as with the outlet from thepump I9 is an accumulator which is designated generally by the referencenumeral 30. The accumulator 3D comprises a vertical cylinder 3| in whicha piston 32 is slidably mounted. Suitable'weighting means, as at 33, ismounted on the'upper end ofv the piston 32. A safety by-pass 34 extendsbetween an upper portion of the cylinder 3| and the conduit 26, saidby-pass connecting to said conduit at a point between the multiway valve21 and the well.

A check valve 35 is interposed in the by-pass 3i. The multiway valve 21-may be driven by any suitable mechanism, as at 36, from the power plant20 or from any other suitable source of power.

With the valve 21 in the position shown in Figure 6 of the drawings thetubing I is in communication with the pump I9 and the fluid which hasbeen drawn into said pump from the supply tank 25 is forced through theconduit 26 into the well for lowering the valved piston I3 against thetension of the coil spring I in the manner hereinbefore described. Thevalve 21 then shifts to the position shown in Figure 7 of the drawingsfor establishing communication between the well and the storage tank 29through the conduit 28 for the passage of the fluid which is pumped 1from the well to said storage tank. While the valve 21 is in thislast-mentioned position the operating uid from the constantly runningpressure pump I9 enters the cylinder 3| and raises the piston 32, thusstoring or accumulating the power as well as permitting said pressurepump I 9 to operate continuously. The fluid thus stored in the cylinder3l under pressure from the weight 33 and the piston 32 is always readyto flow into the conduit 26 for maintaining a constant and uniform fluidpressure. If, for any reason, too much fluid sho'uld be forced into thecylinder 3l the piston 32, when it has been raised high enough, willuncover the by-pass 34 and permit the excess fluid to flow through theby-pass 34 into the conduit 26 and then through the multiway valve 21and the conduit 28 into the storage tank 29. Return flow of the fluidthrough the by-pass 34 is prevented by the check valve 35. It will thusbe seen that in this manner ejection of the piston 32 from the cylinder3| will be prevented.

It is believed that the many advantages of a rodless pump constructed inaccordance with the present invention will be readily understood, andalthough a preferred embodiment of the apparatus is as illustrated anddescribed, it is to be understood that changes in the details ofconstruction and in the combination and arrangement of parts may beresorted to which will fall within the scope of the invention asclaimed.

What is claimed is:-

1. In a pump comprising a well tubing and a fluid operated pump mountedin said tubing, a pressure pump, a conduit connecting said pressure pumpto the tubing for forcing an operating fluid under pressure into saidtubing, a multiway valve interposed in the conduit, a cylindercommunicating with said conduit at a point between the pressure pump andthe multiway valve, a gravity actuated iluid elevated piston slidablymounted in the cylinder, a conduit connecting said cylinder with thefirst-named conduit at a point between the multiway valvel and thetubing, a check valve interposed in the second-named conduit forpreventing return flow of uid to the cylinder, a storage tank, and aconduit connecting said storage tank to the multiway valve, saidmultiway valve constituting means for alternately connecting thepressure pump and the storage tank with the tubing.

2. A pump comprising a tubing, a barrel mounted on the lower end of saidtubing, a sleeve mounted in the tubing, a seat in the lower end portionof said sleeve, a iioating cylinder mounted in the sleeve, a valve onthe lower end of said cylinder engageable with the seat, a rod extendingfrom the barrel through the floating cylinder, the sleeve and into thetubing, a valved piston on the lower end of said rod operable in thebarrel, a spring mounted on the upper end of the sleeve and connected tothe upper end of the rod for elevating the valved piston, and a fluidactuated piston fixed on the rod and operable in the floating cylinderfor lowering the first-named piston against the tension of the spring.

3. In a structure'of the class described, an upper tubing, a lowertubular barrel threaded at its upper end into the lower end of the uppertubing, a sleeve member in the upper tubing having a reduced lower endand an internal valve seat therein adjacent said end, a collar on thereduced end of the sleeve member adapted to seat v on the upper end ofthe lower barrel, a cup washer interposed between the collar and thelarger adjacent part of the said sleeve member, a floating cylinder insaid sleeve member having an enlarged valve-like lower end for coactionwith said seat to close the lower end of said sleeve member, coactingstops on said sleeve member and cylinder for limiting upward movement ofthe latter relative to the former and comprising studs in said sleevemember, a piston rod extending from the barrel through the sleeve memberand cylinder, a valved piston on the lower end of said rod within saidbarrel, a tension spring interposed between the upper end of the sleevemember and rod and urging said rod upwardly, a fluid operated piston onsaid rod withinv saidcylinder for lowering said rod and .valved pistonagainst the tension of said spring, and means for introducing uid underpressure into the tubing.

WALTER N. HUFF.

